It’s the “Allow App to Track” or however it’s worded. You have to click allow or the game won’t work. I had the same issue when I transferred my game to a new device. I always say no to any kind of tracking but Sims Freeplay says we have to click allow. You probably need to reinstall the app. When you do it will ask near the very beginning in a box “Allow app to track” answer “Allow”. Once you do. It will work.
Your other problems with the babies is way over my pay grade but someone will be along to help you that will know what to do. Someone allows does. 👍🏻😊